1
general::
Exhibit indications or hints of, as in She definitely shows signs of accepting the appointment, or Terry's health shows no signs of improvement. [Late 1400s]
American Heritage Idioms
2
general::
Phrase(s): show signs of something
to show hints or indications of something. • I let the horse run at full speed until it began to show signs of tiring. • Sally is showing signs of going to sleep.
McGrawhill's American Idioms And Phrasal Verbs