Meaning: absolutely clear, easy to understand.

Example:
The instructions for preparing the dish are crystal clear.

Meaning: to like something. To one's liking, taste and so forth

Example:
1.- This music is much more my cup of tea than this new stuff.
2.- I enjoy museums, it is my cup of tea.

Meaning: to talk about a subject in an eager tone. To speak about something continuously, to other people's annoyance.

Example:
1.- The opposition party was in full cry in the parliament yesterday to ensure that the changes proposed by the government are not passed as legislation.
2.- I heard her full cry and ignored it, as usual.

Meaning: in a critical moment or crucial time, or in a tight corner.

Example:
It's always the same, she promise help, but as soon as when it comes to the crunch she invents excuses.