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Towards the end of the Qin Dynasty, Han Xin went to join Liu Bang and was assigned a minor official position managing provisions.
When Liu Bang broke camp to prepare to move to his fiefdom in Hanzhong, many officers secretly fled. Han Xin also seized the opportunity to escape.
Xiao He, upon learning of this, rushed to pursue him overnight without even informing Liu Bang.
Liu Bang, finding Xiao He absent, felt perplexed, as he regarded Xiao He as indispensable, like his left and right hands.
Two days later, Xiao He successfully brought Han Xin back.

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Open the tool →如左右手 (rú zuǒ yòu shǒu) is a Chinese idiom (chengyu) meaning “refers to someone who is an indispensable and highly capable assistant”.
如左右手 is pronounced rú zuǒ yòu shǒu in Mandarin Chinese.
Literally, 如左右手 means “like left and right hands”. It is used to mean “refers to someone who is an indispensable and highly capable assistant”.
如左右手 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
象自己的左右手一样。比喻极得力的助手。也比喻两者关系极为密切或配合得很好。