in ‧ ter ‧ sperse /ˌɪntəˈspɜːs $ -tərˈspɜːrs/ BrE AmE verb [transitive usually passive]
[ Date: 1500-1600 ; Language: Latin ; Origin: interspersus 'interspersed' , from sparsus ; ⇨ ↑ sparse ]
1 . be interspersed with something if something is interspersed with a particular kind of thing, it has a lot of them in it:
sunny periods interspersed with showers
2 . intersperse something with something to put something in between pieces of speech or writing, parts of a film etc