for trader the right word is "buying in stages". in the end the trader will 'accumulate' or add on shares on the same counter too.
is like you want to spend $10k on DIGI in one short, but afraid the share might not go up as per your TA, you buy $2k first, then a few days later, spend another $2k. very good strategy. do same when selling, stagger them. so if the share price down 10% on the same or on the next day, you lose $200 instead of $1,000 right away.
buying in stages for a period of 5 years and above, never sell, like buying unit trust like, that's real investing.