1.
If a place is ~ with things, they are lying scattered there.
The front room was ~ with books and clothes...
The riverbed was ~ with big boulders.
ADJ: v-link ADJ with n
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Strewn is also a combining form.
...a litter-~ street.
...a rock-~ hillside.
COMB in ADJ
2.
Strewn is the past participle of strew .