HSK 7-9
勒
lēi动
(literary) bridle; halter; headstall; to rein in; to compel; to force; (literary) to carve; to engrave
安全带不能勒得胸口太紧。
Ānquándài bùnéng lēi de xiōngkǒu tài jǐn.
A seat belt should not constrict the chest too tightly.
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Appears across levels (7-9) in the HSK 3.0 word list.