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rappel (n.)

mountaineering technique for descending steep faces, 1931, from French rappel, literally "recall" (Old French rapel), from rapeler "to recall, summon" (see repeal (v.), which is a doublet). The same word had been borrowed into English earlier to mean "a drum roll to summon soldiers" (1848). For spelling, see rally (v.1).

rappel (v.)

1957 in the mountaineering sense; see rappel (n.). Related: Rappelled; rappelling.

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Definitions of rappel from WordNet
1
rappel (v.)
descend by means of a rappel;
Synonyms: abseil / rope down
2
rappel (n.)
(mountaineering) a descent of a vertical cliff or wall made by using a doubled rope that is fixed to a higher point and wrapped around the body;
Synonyms: abseil
From wordnet.princeton.edu