smoothen

From smooth +‎ -en.

• IPA^(key): /ˈsmuːðən/

• Audio (Southern England):

  (file)

smoothen (third-person singular simple present smoothens, present participle smoothening, simple past and past participle smoothened)

1. (transitive) To make smooth.
   • 2014, Jennifer Nansubuga Makumbi, Kintu, Oneworld Publications (2018), page 34:

     Men were smoothening the thatch, which ran from the top of the roof to the ground covering the sides and at the back of the building.

2. (intransitive) To become smooth.

• The verb smooth is more common.