Reader's Digest 9月号の記事 "How To Survive Anything" からの引用です。
Don't dally with the mask
During a loss of cabin pressure, the drop in oxygen can knock you unconscious in as little as 20 seconds. Listen to the safety advice of your flight attendants: always secure your oxygen mask before helping others. You can't help if you can't breathe.
記事のタイトルに出てきた "dally" の意味を調べます。
・Oxford English Dictionary: Act or move slowly.: workers were loafing, dallying, or goofing off
・Merriam-Webster's Online Dictionary: to deal lightly: toy: accused him of dallying with a serious problem
"dally" はダラダラとする/行う/扱うと覚えることにします。