Don’t mention it
Definition 1 of 1
Pro Tip 1/3Genuine Minimization
The phrase shows real humility and downplays the effort you put into helping. 
Person A: 'I can't thank you enough for your support.' Person B: 'Don't mention it, it was no trouble at all.'
Pro Tip 2/3Sincerity Indication
Saying 'don't mention it' often indicates that you genuinely mean the help was not an inconvenience. 
Person A: 'This means so much to me, thanks!' Person B: 'Don't mention it, happy to help!'
Pro Tip 3/3Casual Atmosphere
Use this phrase in casual or friendly settings, not in very formal or business situations. 
Person A: 'Thanks for the lift home.' Person B: 'Don't mention it, anytime!'