Bind off, 3 sts at beg of the next row that begins at underarm, then K 2 sts tog at beg of every row at underarm until you have 7 sts off.
Shape the jacket by crocheting the sleeves and underarmseams together.
Sew up the sleeves andunderarm seams and turn back the cuffs.
Fasten wool where you started the underarm chain, make the required number of stars (not widening) across shoulder, and 9 stars on the chain under the arm.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "underarm" in a variety of sentences. We hope that you will now be able to make sentences using this word.