| 单词 | ratchet screwdriver |
| 释义 | ratch1 /rach/noun
ORIGIN: Cf Ger Ratsche, Fr rochet ratchˈet noun A pawl and/or ratchet-wheel transitive verb and intransitive verbTo move by, or as if by, a ratchet mechanism, by steady, progressive degrees (with up or down) ratchet screwdriver noun (building, etc) A screwdriver with a ratchet mechanism to make it operate in one direction only ratchˈet-wheel noun A wheel with inclined teeth with which a pawl engages |
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