This means immediately; at the very beginning. It describes a sprinter blasting out of the starting blocks at the beginning of a short distance race (e.g., 100-yard dash, 50-yard dash).
If something rings a bell, it reminds you of something you have heard before, though you may not be able to remember it very well. A name may ring a bell, so you know you have heard the name before, but cannot place it properly.
Rip van Winkle is a character in a story who slept for twenty years, so if someone is a Rip van Winkle, they are behind the times and out of touch with what's happening now.
If someone has a great and sudden change in their ideas or beliefs, then this is a road to Damascus change, after the conversion of Saint Paul to Christianity while heading to Damascus to persecute Christians.
(USA) It's a expression used in the Southern USA that means that you must look out for yourself as no one's going to do it for you. (It can be shortened to 'root hog'. A hog is a pig.)
If something is rough and ready, it has not been carefully prepared, but is fit for its purpose. If a person is rough and ready, they are not very refined or mannered.
If someone has gone round the bend, they have stopped being rational about something.
If something drives you round the bend, it irritates you or makes you angry.
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