to link (two things) together

Assemble the two halves before connecting them

to link (an electrical apparatus) with a power supply

connect the laptop to the mains

(often + with) to associate (two things) mentally

I failed to connect the face with the name

to constitute a link between (two things)

What connects them?

to link (two callers) by telephone

Just trying to connect you

(often + with) to be joined

The bathroom connects with the bedroom

(often + with) said of a train, bus, etc: to be timed to reach its destination in time for passengers to transfer to another train, bus, etc or other form of transport

informal (also + with) said of a hit or shot: to find its target; to hit home

My fist connected with his jaw