Use 'rally round' when people come together to support during tough times or crises. When the hurricane hit, the whole town rallied round to rebuild homes.
Pro Tip 2/3
Emotional Support
'Rally round' often implies giving emotional comfort along with help. She was feeling depressed, but her friends rallied round to cheer her up.
Pro Tip 3/3
Group Unity
The phrase emphasizes unity in the group supporting the cause or person. When the company faced bankruptcy, employees rallied round to save it.