Meanings

go players and bird keepers are idiots (both activities demand a lot of time)

button mashing (e.g. in video games)

left-handed batter

hitting right-handed (with a racket, bat, etc.)

hitting left-handed (with a racket, bat, etc.)

right-handed batter

intensive zazen meditation on a subject

chō-han bakuchi

to stand under a waterfall (as spiritual training)

carrier strike group

to vaccinate

the most home runs

home run king

solid printing

launch vehicle

to operate a cash register

eight-strand braid (rope)

one-legged batting stance

top of the (batting) order

bottom of the (batting) order