Word: 缝儿 (fèngr)

老鼠跌进铁桶里,无缝儿可钻

lǎoshǔ diējìn tiětǒng lǐ,wú fèngr kě zuān

a mouse falls into an iron bucket: no crack to slip through

锅台裂缝儿，坏灶

guōtái liè fèngr, huài zào

a crack in the stove top: a bad stove (omen)

隔着门缝儿看人，把人瞧扁了

gézhe mén fèngr kàn rén, bǎ rén qiáobiǎn le

looking at a person through a door crack: seeing them flattened

隔着门缝儿看吕洞宾，小看大仙

gézhe mén fèngr kàn Lǚ Dòngbīn, xiǎokàn dàxiān

looking at Lü Dongbin through a door crack: underestimating a great immortal

骨缝儿里的肉，两面都碰硬

gǔ fèngr lǐ de ròu, liǎngmiàn dōu pèngyìng

flesh in the crack between bones: hard on both sides

鸡蛋壳儿上找缝儿，白费这番好心

jīdànkér shàng zhǎo fèngr, báifèi zhè fān hǎoxīn

looking for a crack on an eggshell: good intentions wasted