Rat-a-tat and Trash can

Rat-a-tat noun - A series of short sharp taps (as made by strokes on a drum or knocks on a door).

Trash can and rat-a-tat are semantically related. In some cases you can use "Trash can" instead a noun phrase "Rat-a-tat".

Trash can noun - A bin that holds rubbish until it is collected.

Rat-a-tat and trash can are semantically related. Sometimes you can use "Rat-a-tat" instead a noun phrase "Trash can".