Wiktionary
cover one's bases
alt. (context idiomatic English) To be thorough; to prepare thoroughly or completely. vb. (context idiomatic English) To be thorough; to prepare thoroughly or completely.
Usage examples of "cover one's bases".
Two hours earlier, he'd called Arnie van Datnm, another old friend, because one had to cover one's bases as a reporter.
Two hours earlier, he'd called Arnie van Damm, another old friend, because one had to cover one's bases as a reporter.