bubble under
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To be almost there — nearly at the top or ready to come out, but not quite yet.
"The band's new single has been bubbling under the Top 40 for three weeks now."
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Full Marco Rubio press conference: Trump official talks Pope Leo meeting in White House briefing
USA TODAY · 2:13
to provide a protective bubble under which they can operate and move
Live: Rubio holds White House press briefing before Pope Leo meeting amid Iran war Hormuz blockade
USA TODAY · 22:22
to provide a protective bubble under which they can operate and move