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Paddle one's own canoe 做自己的事 (来源：英语论坛 http://bbs.englishcn.com)

Pain is forgotten where gain follows. 好了疮疤忘了痛

Pain past is pleasure. 痛苦过后是欢乐

paint the lily 画蛇添足

Pardon all but thyself. 原谅别人但不要原谅自己

part and parcel 主要部分

pass the buck 推卸责任

pass muster 基本合格

patience on a monument 极有耐性之人

The path to glory is always rugged. 光同之路长坎坷

pay back in one's own coin 以其人之道还其人之身

pay lip-service to 口头帮忙

The pen is mightier than the sword. 笔强于剑

Pen and ink is wit's plough. 笔墨是智慧之犁。

A penny saved is a penny earned. 省一便士等于挣一便士。

Penny-wise and pound-foolish. 小事聪明，大事糊涂。

Perseverance is the only road to success. 不屈不挠是取得胜利的唯一道路

a piece of cake 小事一桩

Plain living, high thinking. 一帆风顺

play ducks and drakes with 挥霍浪费

play fast and loose 反复无常

play for safety 不冒风险

play havoc with 搅乱，破坏

play second fiddle 处于次要地位

Pleasant hours fly past. 好景不长

Please all and you please none. 讨好所有的人结果讨不到好

plough the sand 白费力气

The pot calling the kettle black. 锅嫌壶黑

pour oil on troubled water 平息风波

Poverty is no disgrace. 贫穷不是耻辱

Practice makes perfect. 熟能生巧

Prepare for a rainy day. 未雨绸缪

Prevention is better than cure. 预防胜过治疗

Pride goes before a fall. 骄傲必败

Procrustean bed 逼人就范之物

A promise is a debt. 许诺等于欠债。欠债要清，许诺要还。

Promise little, but do much. 少许愿，多做事。

Proof is better than argument. 事实胜于雄辩。

The proof of the pudding is in the eating. 吃了布丁才知其味

Prosperity makes friends, and adversity tries them. 顺境交的朋友，逆境接受考验。

Providing is preventing. 有备无患

pull the chestnuts out of the fire 火中取栗--替人冒险

pull one's leg 开玩笑，捉弄人

pull one's punches 不用全力

pull one's weight 竭尽全力 pull strings 幕后操纵

The purest gold is the most ductile. 最纯的金最柔软

put the cart before the horse 本末倒置

put on airs 装模作样

put on the screw 施加压力

put one's cards on the table 摊牌

put a spoke in someone's wheel 阻挠某人的行动

put two and two together 罗列现象，进行推理