Seal
Seal In, Closing
You take two clumps of dirt to make a measurement, using them to seal each side of your measuring tape, so it stays on the ground. This is the way people used to seal in things back in the day, back when we didn't have fancy things like tape and glue.
ふう, ほう
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You can also seal food (ふう) in dirt to make it last longer. That's how jerky came about, you know. Seal some meat underground and in a few months you'll have some tasty dried meats to chew.
By the way, this has another reading you should probably know. It's ほう. Most sealing is done in the home (ほう), you know? So just think about eating food in your own home!