Question

Did you pick up his nervousness?  Did you pick up on his nervousness?‎

Accepted Answer

(transitivehttps://en.wiktionary.org/wiki/Appendix:Glossary#transitive and intransitivehttps://en.wiktionary.org/wiki/Appendix:Glossary#intransitive  with on, by extension) To noticehttps://en.wiktionary.org/wiki/notice, detecthttps://en.wiktionary.org/wiki/detect or discernhttps://en.wiktionary.org/wiki/discern, often used with "on".

Sentence	Did you pick up his nervousness? Did you pick up on his nervousness?‎
Definition	( transitive https://en.wiktionary.org/wiki/Appendix:Glossary#transitive and intransitive https://en.wiktionary.org/wiki/Appendix:Glossary#intransitive with on, by extension) To notice https://en.wiktionary.org/wiki/notice , detect https://en.wiktionary.org/wiki/detect or discern https://en.wiktionary.org/wiki/discern , often used with "on".

Pick Nervousness? Nervousness?‎ Extension Did