-le

1.
a suffix of verbs having a frequentative force:
dazzle; twinkle.
2.
a suffix of adjectives formed originally on verbal stems and having the sense of “apt to”:
brittle.
3.
a noun suffix having originally a diminutive meaning:
bramble.
4.
a noun suffix indicating agent or instrument:
beadle; bridle; thimble.
Origin
Middle English -len, Old English -lian (v.); Middle English -el, Old English -ol (adj.); Middle English -el, Old English -il (diminutive); Middle English -el, Old English -ol, -ul (agent)
British Dictionary definitions for -le

-le

suffix
1.
denoting repeated or continuous action, often of a diminutive nature: twiddle, wriggle, wrestle
Word Origin
from Middle English -len, Old English -lian, with similar significance