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in the PONS Dictionary

flatten [ˈflætn] VB trans

1. flatten (make level):

flatten
де́лать пло́ским
to flatten oneself against sth
пло́тно прилега́ть к чему́-ли́бо

2. flatten MUS:

flatten
понижа́ть тон
Present
Iflatten
youflatten
he/she/itflattens
weflatten
youflatten
theyflatten
Past
Iflattened
youflattened
he/she/itflattened
weflattened
youflattened
theyflattened
Present Perfect
Ihaveflattened
youhaveflattened
he/she/ithasflattened
wehaveflattened
youhaveflattened
theyhaveflattened
Past Perfect
Ihadflattened
youhadflattened
he/she/ithadflattened
wehadflattened
youhadflattened
theyhadflattened
See further verb tables