把【bǎ, bà】
(bǎ) 1. control; to hold; to contain; dominate 2. used to shift the object to before the verb (bà) 3. handgrip; handle
(bǎ) [动] 1、用手握住;把守,看守;掌握,控制 [介] 2、表示对人或事物的处置 (bà) [名] 3、器具上便于用手拿的部分

清朝光绪年间,一直是慈禧太后把持朝政。
During the reign of Emperor Guangxu in the Qing Dynasty, Empress Dowager controlled the affairs of the state.

出门记得把雨伞带上,以防下雨。
Remember to take an umbrella with you before getting out in case it rains.

那把菜刀的把断了,不能切东西。
The kitchen knife cannot be used to cut because its handle has broken.
把柄【bǎ bǐng】
1. handhold; handle 2. handle
[名] 1、器物上的便于用手拿的部分 2、比喻可以被人利用来进行攻击的错误等

不要太用力,这只锅的把柄很容易坏。
Do not exert too much force on the handle of the pan, for it is not firm.

如果你光明正大,就不会被别人抓住把柄。
You will not give others a handle against yourself if you remain open and aboveboard.
把关【bǎ guān】
1. guard a pass; hold the pass 2. check on
[动短] 1、把守关隘 2、比喻根据一定的标准或原则,严格掌管

前面街道的路口有交通警察把关。
A policeman is guarding the pass ahead.

质检部门要对食品安全问题严格把关。
Department in charge of quality control should strictly check on the safety of food.