border on (something)

to be similar in quality or character.

I thought the author's criticism bordered on rudeness.

Usage notes: usually used about negative qualities

• just a second
• just between you and me
• just for the heck of it
• just for the hell of it
• just in case
• just in the nick of time
• Just my luck!
• just now
• just one of those things
• just say the word
• just so
• just the ticket
• just the tip of the iceberg
• just this side of
• just this side of something
• just to be on the safe side
• just what the doctor ordered
• kangaroo court
• keel over
• keep abreast of
• keep abreast of something
• keep a civil tongue in head
• keep a civil tongue in your head
• keep a close watch on
• keep a close watch on someone