Definition of keychain drive in English:

keychain drive

Syllabification: key·chain drive
Pronunciation: /ˈkēˌCHān ˌdrīv/

Entry from US English dictionary

noun

Computing
Another term for USB flash drive.

Definition of keychain drive in:

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Word of the day flippant
Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude