keep

the main tower within the walls of a medieval castle or fortress

retain possession of

“Can I keep my old stuffed animals?”

supply with necessities and support

“There's little to earn and many to keep”

stick to correctly or closely

“keep count”

retain rights to

“keep my job for me while I give birth”

fail to spoil or rot

“These potatoes keep for a long time”

a cell in a jail or prison

prevent (food) from rotting

“keep potatoes fresh”

cause to continue in a certain state, position, or activity; e.g., `keep clean'

“The students keep me on my toes”

maintain for use and service

“I keep a car in the countryside”

allow to remain in a place or position or maintain a property or feature

“The family's fortune waned and they could not keep their household staff”

maintain by writing regular records

“keep a diary”