1. Use

By forming a derivate, you get a close-meaning verb, which indicates that the action happens multiple times, that the action is continuous, or that the ending of the action isn't specified.

2. Examples

Verbs Explanations
hoitaa to take care of a child, a garden etc
hoidella to take care of multiple things in a row e.g. go to the bank, the post office, the shop etc.
kysyä to ask
kysellä to keep asking questions (not the same question)
laulaa to sing
laulella to sing carelessly, sing along, hum along
kääntää to turn
käännellä to keep turning something this way and that (e.g. trying to fit a couch through the doorway)
kiertää to circle
kierrellä to walk around, seeing places without a purpose
soittaa to call
soitella to call around, either without a purpose (friends) or for your job (soitella asiakkaille)
tavata to meet
tapailla to meet often; to date someone
avata to open
availla to open a door again and again (like a doorman at a bar)
kerätä to gather
keräillä to collect stamps, stickers, butterflies,...
korjata to fix
korjailla to fix e.g. cars as a hobby in a garage; teacher correcting tests
etsiä to search
etsiskellä to walk around looking for your watch everywhere for example
nauraa to laugh
naureskella to laugh e.g. with some friends during the entire evening
lukea to read
lueskella to read crisscross through a book; to read a lot of diverse things
pohtia to ponder
pohdiskella to philosophize
miettiä to think
mietiskellä to think while e.g. filling a crossword puzzle
itkeä to cry
itkeskellä to be very sad for a long time (after break-up, death in the family,...)