‘借口’ (jiè kǒu) literally combines ‘借’ (jiè), meaning ‘to borrow’ or ‘to use’, and ‘口’ (kǒu), meaning ‘mouth’ or ‘speech’. Together, it refers to a reason—often false, weak, or insincere—that someone gives to justify behavior, avoid responsibility, or explain away failure. It carries a mildly negative connotation: while not always malicious, it implies the reason is convenient rather than truthful.

This word is commonly used in everyday conversation, workplace settings, and interpersonal conflicts—especially when someone deflects criticism or declines a request. It appears frequently after verbs like ‘找’ (zhǎo, ‘to find’), ‘编’ (biān, ‘to fabricate’), or ‘用’ (yòng, ‘to use’). Unlike neutral terms like ‘理由’ (lǐyóu, ‘reason’), ‘借口’ suggests the speaker doubts the validity of the explanation.