be child's play

/biː tʃˈaɪldz plˈeɪ/

to be child's play

to involve no difficulty

synonyms : breeze

activity by children that is guided more by imagination than by fixed rules

synonyms : play

Examples

1. The severest toil was child's play compared with this.

2. This seems like child's play.

3. For a natural athlete like me, mastering this sport would be child's play.

4. What Donald Trump has done makes what Joe McCarthy did in the early '50s look like child's play.