Chink in one’s armour = A minor but very detrimental flaw or weakness.
- Yeah, he’s brilliant, but his violent temper has destroyed many business relationships. It’s really the chink in his armour.
- Putting things off to the last minute is the chink in Mary’s armour and is bound to get her in trouble one day.
Whet one’s appetite = to awaken a desire/ increase the feeling/stimulate appetite or desire; to sharpen the blade of( a tool or weapon).
- Cinemas use trailers to whet viewers’ appetite and make them want to see the whole film.
- She took out her dagger and began to whet its blade in even rhythmic strokes.
- I have been listening to V.R.Dilipkumar’s classical concerts for many years and it whetted my appetite for Carnatic raagas.
The icing on the cake = an additional benefit or positive aspect to something that is already considered positive.
- Having all of you here for my birthday has really been wonderful! This gift is an icing on the cake.
- The athlete received a gold medal and the icing on the cake was that he also received a sponsorship deal.