plegen

From Middle Dutch plien, later plēgen, originally a class 4 strong verb. Presumably from Old Dutch *plian, from Proto-West Germanic *plehan (“to vouch for”). However, the form plegan already occurs in Old Dutch with -g-, and likewise for Old Saxon plegan and Old High German pflegan, so it is not certain what the exact relationship between the words is.

plegen

to do (something) habitually, customarily
Synonym: gewoon zijn

Mijn grootvader pleegt na het middageten een pijp te roken.
My grandfather usually smokes a pipe after lunch.
to usually happen
Op onze wandelvakanties placht het vaak te regenen.
On our trekking holidays, it often rained.

More information Conjugation of (weak with past in -cht), infinitive ...

Note: geplogen is also used instead of geplacht

From the same origin as above. The formation of the weak past occurred in early modern Dutch.

plegen

(transitive) to commit (a crime)
- 2019 April 29 (last accessed), “Archived copy”, in gezondheid‎, archived from the original on 23 November 2007:
  In Vlaanderen plegen elke dag drie mensen zelfmoord.
  Each day in Flanders three people commit suicide.
(transitive, dated) to care for
Synonyms: verplegen, verzorgen

Conjugation of plegen (weak with past in -cht)
infinitive	plegen
past singular	placht
past participle	geplacht
infinitive	plegen
gerund	plegen n
	present tense	past tense
1st person singular	pleeg	placht
2nd person sing. (jij)	pleegt, pleeg²	placht
2nd person sing. (u)	pleegt	placht
2nd person sing. (gij)	pleegt	placht
3rd person singular	pleegt	placht
plural	plegen	plachten

subjunctive sing.¹	plege	plachte
subjunctive plur.¹	plegen	plachten

imperative sing.	pleeg
imperative plur.¹	pleegt

participles	plegend	geplacht
¹⁾ Archaic. ²⁾ In case of inversion.

Dutch