challengingphase

noun
UK /ˈtʃæl.ɪn.dʒɪŋ feɪz/
US /ˈtʃæl.ən.dʒɪŋ feɪz/

A challenging phase is a time when things are hard to do.

Learning to ride a bike was a challenging phase for me.


OTHER MEANINGS

2. A stage in a project that requires extra effort and problem-solving.

The team pushed through the challenging phase of the build.

3. A period in a game or competition where the difficulty increases.

Level five is the challenging phase of the game.

4. A developmental stage in which a person faces new demands.

Toddlerhood is a challenging phase for many parents.