dig in one's heels
resist stubbornly/refuse to give in
not the only pebble on the beach
there are other possibilities/not the only person to be considered
within a stone's throw
the places are close to each other
hold the wrong end of the stick
misunderstand something/to get the wrong idea about something
wool-gathering
daydream/endless dreamy imagining
once in a blue moon
very rarely
