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Definition of Pick up on
1. Verb. (transitive idiomatic) To notice, observe, learn, or understand, especially something otherwise overlooked. ¹
2. Verb. (transitive idiomatic) To continue or build upon (for example, a task, analysis, or narrative), beginning from a point at which someone has previously stopped. ¹
3. Verb. (transitive idiomatic) To adopt a practice in which others already engage. ¹
¹ Source: wiktionary.com