долби́ть

verbimperfective (partner вы́долбить)uncommon

1.
to pound, to hammer, to bang, to peck at
Дя́тел долби́т кору́ де́рева.
The woodpecker is hammering at the tree bark.
Of repeated blows: a bird's beak, a pick, a fist.
2.
to hollow out, to chisel, to gouge, to carve out
Он долби́л ло́дку из це́льного ствола́.
He was hollowing out a boat from a single tree trunk.
Working wood or stone with a chisel or similar tool.
3.
to cram, to swot, to mug up
Он всю ночь долби́л исто́рию пе́ред экза́меном.
He crammed history all night before the exam.
Colloquial.

Examples

Мы каждый день долбим новые слова
We cram new words every day.
Дятел долбит дерево целый день
The woodpecker hammers at the tree all day.
Рабочий долбит стену молотком
The worker is hammering at the wall with a hammer.

Note: Stress change.

Imperative
ты	долби́
вы	долби́те

Active present	долбя́щий	pecking, chiseling, hammering, boring
Active past	долби́вший	having chiseled, having pecked, having drilled, having hammered (repeatedly)
Passive present	долби́мый	being pecked, being hammered, being drilled, being chiseled
Passive past	долблённый	chiseled, hollowed out, gouged, dugout
Gerund present	долбя́	while doing (present)
Gerund past	долбив долбивши	while doing (past)