What does pick up mean?

It depends on the context. It can mean to physically pick something up in your hands or arms. It can mean to feel better. It can mean to clean up an area by picking up debris or clutter. It can mean to pay the bill or "pick up" the cheque. It can mean to casually attract someone romantically or sexually. It can mean to acquire or learn something without formal study or arrangements. It can mean to detect something. It can mean to attractively accentuate another item.

It can also be a noun. It can mean a type of truck. It can mean the act of doing any of the above meanings. It can mean the reception of signals by electronic apparatus. It can mean a device that produces an electrical signal in response to some other signal.