(~s)
1.
A message of ~ is a message in which you express your sympathy for someone because one of their friends or relatives has died recently.
Neil sent him a letter of ~.
N-UNCOUNT
2.
When you offer or express your ~s to someone, you express your sympathy for them because one of their friends or relatives has died recently.
He expressed his ~s to the families of the people who died in the incident.
N-PLURAL