Remember drop-vowel nouns? The vowel in the last closed syllable drops out:

álom > álmok, tükör > tükrök…

Well, drop-vowel verbs are the same, but you have to pay attention when the vowel drops out. Our deep and high verb examples are: töröl (to wipe, to dust), megtorol (to revenge)

INDEFINITE AND DEFINITE CONJUGATION – HIGH:
törlök – törlöm
törölsz – törlöd
töröl – törli
törlünk – töröljük
töröltök – törlitek
törölnek – törlik

INDEFINITE AND DEFINITE CONJUGATION – DEEP:
megtorlok – megtorlom
megtorolsz – megtorlod
megtorol – megtorolja
megtorlunk – megtoroljuk
megtoroltok – megtoroljátok
megtorolnak – megtorolják

Indefinite conjugation for high verbs:
1st PS and 1st PP drop a vowel
Definite conjugation for high verbs:
all drop a vowel except 1st PP

Indefinite conjugation for deep verbs:
1st PS and 1st PP drop a vowel
Definite conjugation for deep verbs:
1st PS and 2nd PS drop a vowel

Drop-vowel verbs are usually used in indefinite conjugation only. It makes sense conjugating only a few in definite.

More example verbs:

forog (to turn), pörög (to spin), őröl (to grind), korog (to rumble), morog (to growl), hörög (to rattle in one’s throat), dörög (to thunder), pödör (to twist)