recoil: implies a start of a movement away prompted by shock, fear, or disgust: ~s at the sight of blood.
shrink: suggests an instinctive recoiling through sensitivities, scrupulousness, or cowardice: refused to ~ from responsibilities. cowardice胆怯语气比fear害怕重，因此shrink语气比recoil重 （scrupulous审慎正直的；恪守道德规范的careful to be honest and do what is right，如he was scrupulous in all his business dealings他在一切商业交易中都是审慎正直的）
flinch: implies a failure to endure pain or to face something dangerous or frightening with resolution: faced her accusers without ~ling. 谐音
wince: suggests a slight involuntary physical recoiling from what pains, frightens, or disgusts: ~d when the new secretary called him by his first name.
blench: implies fainthearted, fearful flinching: never ~ed even as his head was lowered on the guillotine. 3个f （fainthearted胆小的胆怯的not confident, not taking strong actions, because being afraid of failing，如this is no time to be faint-hearted现在不是怯懦的时候，词组not for the faint-hearted表示不适合怯懦的人applies to something that is unusual or extreme, and is not suitable for people who like only safe and familiar things，如it's a film about a serial killer and not for the faint-hearted这部电影是讲连环杀手，不适合胆小的人看） 断头台
quail: suggests a shrinking and cowering in fear: ~ed at the fury of the storm. （cower畏惧suggests a display of abject fear before someone who threatens or domineers在危险或专横的人面前表现得畏惧可怜，如as an adult he still cowers before his father他虽已成年，在父亲面前仍然表现得畏缩）
recoil后退避开: 指向后退，因害怕惊讶恶心，shrink退缩: 表示本能地后退，因胆怯敏感审慎，flinch退缩: 指未能坚强地忍受痛苦或面对危险，wince后退: 表示不自觉地微微后退，因害怕痛苦恶心，blench畏缩: 指退缩时胆小畏惧 ，quail畏缩: 表示畏惧退缩
记忆方法: 1）首字母RSFWBQ不问人情是非<==退缩
2）退缩的意思是后退，由于害怕厌恶mean to draw back in fear or distaste. RSFWBQ不问人情是非<==退缩
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