(idiomatic) In operation, in progress, commenced. / (nautical, of a vessel) moving through the water; not anchored, moored, aground, or beached. / Into motion, into its course.

while protesting / (US, law) of a payment made subject to dispute / Without full agreement.

protected by a covering or shelter

Subjected to enemy attack with firearms. / (figuratively) Criticized or held responsible for something.

(Britain, Ireland, colloquial) In an underhand way, sneakily; unofficially, particularly with regard to payment or tax avoidance.

Illicitly, against regulations, of goods kept under the serving counter in a shop to be unobtrusively passed to a customer who knows they are available for surreptitious sale (e.g. pornographic magazines in a newsagent).

Alternative spelling of underripe

(adjectival) Secret; covert; undisclosed. / (adverbial) Secretly; covertly; undisclosedly. / Used other than figuratively or idiomatically: see under, table.

(rail transport, slang, Britain) A person under a train; a person hit by a train after jumping or falling in front of it.

Illicit, obtained or sold furtively.