Third-person singular present tense of backslap (he/she/it backslaps), or plural noun meaning multiple back-slapping actions or gestures.
From 'backslap' with regular conjugation for third-person singular present tense ('-s') or regular pluralization ('-s') for the noun form.
The versatility of 'backslaps' shows how English reuses words as both verbs and nouns—the same word can describe what a politician does and the actual pats they give.
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