keep on ones toes - be ready for action; prepared
knock oneself out - make a great effort
make ends meet - to get just enough money for noes needs
make out - manage;get along
mean to - intentional; on purpose
keep onesfingers crossed - wish that nothing goes wrong
in the dark - keep someone without knowdge; information from somenoe
hold off - delay;postpone
hop to it - get started on something quickly
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