Definition of "in depth" [in depth]

• Comprehensive, thorough, detailed. (adjective)

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• "Check the Value Line Investment Survey, which analyzes about 50 companies in depth each quarter."
• "RCHA, lying back in depth - a task of engaging armour over open sights which they had no great relish to attempt."
• "It was plain, too, that, by so doing, he would give protection in depth to the TOW and Blowpipe missile launchers which were to be tucked in behind the village on the higher ground."