defend, protect, safeguard, guard, shield, shelter, harbour

名詞 guard:

1. a person who keeps watch over something or someone
2. the person who plays that position on a football team
3. a device designed to prevent injury
   同義詞：safety, safety device
4. a posture of defence in boxing or fencing
5. the person who plays the position of guard on a basketball team
6. a group of men who escort and protect some important person
   同義詞：bodyguard
7. a precautionary measure warding off impending danger or damage or injury etc.
   同義詞：precaution, safeguard
8. the duty of serving as a sentry
   同義詞：guard duty, sentry duty, sentry go
9. a position on the line of scrimmage
10. a position on a basketball team

動詞 guard:

1. to keep watch over
2. watch over or shield from danger or harm; protect
   同義詞：ward
3. protect against a challenge or attack
   同義詞：defend, hold
4. take precautions in order to avoid some unwanted consequence

1. He bribed his way past the guard and escaped.
   他買通看守而逃之夭夭了。
2. Be on guard when somebody flatters you.
   有人奉承你時，一定要當心。
3. There are soldiers on guard at the gate.
   大門口有士兵在守衛(wèi)。
4. The dog guarded the house against strangers.
   狗守衛(wèi)著房屋，不讓陌生人進去。

guard

v.（動詞）
guard.ed,guard.ing,guards
v.tr.（及物動詞）
To protect from harm by or as if by watching over:
保衛(wèi)，守護：通過看守或似乎通過看守而保衛(wèi)…免遭傷害：
例句：
guard a bank; guarding the President.See Synonyms at defend
守衛(wèi)一個銀行；護衛(wèi)總統(tǒng)參見 defend

To watch over so as to prevent escape or violence:
看守：看守以阻止逃脫或暴力：
例句：
guarded the prisoner.
看守犯人

Sports To keep (an opposing player) from scoring or playing efficiently.
【體育運動】 防守：使（對方運動員）不能得分或有效進行比賽
To maintain control over, as to prevent indiscretion:
謹慎使用：對…保持控制以防不慎：
例句：
Guard what you say.
說話時要謹慎

To supervise entry or exit through; keep watch at:
監(jiān)視：監(jiān)督某處的出入；監(jiān)視：
例句：
guarded the door.
監(jiān)視門口

To furnish (a device or object) with a protective piece.
加防護裝置：給（器械或物品）裝防護裝置
Archaic To escort.
【古語】 護送
v.intr.（不及物動詞）
To take precautions:
警惕：采取預防措施：
例句：
guard against infection.
預防傳染

To serve as a guard.
警衛(wèi)：作為警衛(wèi)
n.（名詞）
One who protects, keeps watch, or acts as a sentinel.
警衛(wèi)：象哨兵一樣工作的人，守護，看守的人
One who supervises prisoners.
獄吏，看守：監(jiān)管犯人的人
A group of people serving as an escort or performing drill exhibitions on ceremonial occasions:
護衛(wèi)隊：作為護衛(wèi)或在慶典中走閱兵式的一群人：
例句：
an honor guard.
一個儀仗隊

Chiefly British A railway employee in charge of a train.
【多用于英國】 火車列車員：管理火車的鐵路職員
Football One of the two offensive linemen on either side of the center.
【橄欖球】 側衛(wèi)：中線兩側的兩進攻隊員之一
Basketball Either of the two players normally positioned in the backcourt who are responsible for bringing the ball to and initiating offensive plays from the frontcourt.
【籃球】 后衛(wèi)：通常位于后場的兩隊員之一，負責傳球和從前場組織進攻
Sports A defensive position or stance, as in boxing or fencing.
【體育運動】 防衛(wèi)：在拳擊或擊劍中所處的防守的位置或姿勢

The act or duty of guarding.
防守：防守的行為或職責
Protection; watch:
保護；監(jiān)視：
例句：
a prisoner under close guard.
受嚴密監(jiān)視的犯人

Something that gives protection; a safeguard:
防衛(wèi)物：進行保護的東西；保護物：
例句：
a guard against tooth decay.
防止蟲牙的東西

A device or an attachment that prevents injury, damage, or loss, especially:
防護裝置：防止傷害，損害或損失的裝置或附加裝置，尤其是：
An attachment or a covering put on a machine to protect the operator or a part of the machine.
外殼：機器上的附加裝置或外罩，用以保護操作者或機器的某一部分
A device on a foil, sword, or knife that protects the hand.
護手：鈍頭劍、劍或刀上的保護手的裝置
A padded covering worn to protect a body part from injury:
護身物：保護身體部分免受傷害的襯墊：
例句：
a shin guard.
護脛

A small chain or band attached to a watch or bracelet to prevent loss.
鏈，帶：系在表或手鐲上以防其丟失的小鏈子或帶子
A ring worn to prevent a more valuable ring from sliding off the finger.
戶戒：為防止貴重的戒指滑脫而另戴的戒環(huán)
Electronics A signal that prevents accidental activation of a device or ambiguous interpretation of data.
【電子學】 信號：為防止裝置意外激活或對數(shù)據(jù)含混解釋的信號

<習慣用語>off (one`s) guard
Not alert; unprepared.
不警覺的；未準備的
on (one`s) guard
Alert and watchful; cautious.
謹慎的：警覺且戒備的；謹慎的
stand guard
To keep watch.
監(jiān)視，守望
To act as a sentinel.
擔當哨兵的工作
來源：
Middle English garden
中古英語 garden
from Old French garder, guarder
源自 古法語 garder, guarder
[of Germanic origin] * see wer- 3
[源自日爾曼語] *參見 wer- 3

【引伸】
guard.er
n.（名詞）