expressing good wishes before drinking

‘Cheers,’ she said, raising her glass

expressing good wishes on parting or ending a conversation

‘Cheers, Jack, see you later.’

shout for joy or in praise or encouragement

she cheered from the sidelines

give comfort or support to

he seemed greatly cheered by my arrival

a shout of encouragement, praise, or joy

a tremendous cheer from the audience

cheerfulness, optimism, or confidence

an attempt to inject a little cheer into this gloomy season