to cause a task or opportunity to be missed or neglected due to delay

to delay, waste time, or hold up progress often due to procrastination or negligence

to indulge excessively in something, or to be deeply engrossed in a state or activity, often to one's detriment

to fret or worry about the troubles or fates of historical figures or people from the past

(slang) boys' love, aka BL (genre of homoerotic online literature)