Lock

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Lock

Used in the context of general equities. Make a market both ways (bid andoffer) either on the bid, offering, or an in-between price only. Locking on the offering occurs to attract a seller, since the trader is willing to pay (and ask) the offering side when others only ask it. Locking on the bid side attracts buyers for similar reasons. Typically, the sell side requires a plus tick to comply with short sale rules.
References in classic literature ?
But in spite of this valiant champion of fair ladies in distress, the Baron would not return the lock.
Thus, says the poet, Belinda has no longer need to mourn her lost lock, for it will be famous to the end of time as a bright star among the stars--
When I'm off the lock for good and all, you'll be the Father of the Marshalsea.
The turnkey went off the lock of this world next day.
Again, therefore, she applied herself to the key, and after moving it in every possible way for some instants with the determined celerity of hope's last effort, the door suddenly yielded to her hand: her heart leaped with exultation at such a victory, and having thrown open each folding door, the second being secured only by bolts of less wonderful construction than the lock, though in that her eye could not discern anything unusual, a double range of small drawers appeared in view, with some larger drawers above and below them; and in the centre, a small door, closed also with a lock and key, secured in all probability a cavity of importance.
All the inhabitants of Hampton and Moulsey dress themselves up in boating costume, and come and mouch round the lock with their dogs, and flirt, and smoke, and watch the boats; and, altogether, what with the caps and jackets of the men, the pretty coloured dresses of the women, the excited dogs, the moving boats, the white sails, the pleasant landscape, and the sparkling water, it is one of the gayest sights I know of near this dull old London town.
Boxtel at first entertained an idea of stealing the key, but it soon occurred to him, not only that it would be exceedingly difficult to abstract it from her pocket, but also that, when she perceived her loss, she would not leave her room until the lock was changed, and then Boxtel's first theft would be useless.
Upon this, she unlocked the door, and, passing out, closed it again softly; leaving it to all appearance (when viewed on the inner side) as carefully secured as Agnes had seen it when she tried the key in the lock with her own hand.
We all trooped out into the corridor, leaving the two doctors alone, and I heard the key turned in the lock behind us.
it was fortunate for me that Monsieur Stangerson was in the laboratory when the affair took place and had seen with his own eyes that I was there with him; for otherwise, with this business of my revolver, I don't know where we should have been,--I should now be under lock and bar.
Sikes made no reply; but, pulling open the door, of which Fagin had turned the lock, dashed into the silent streets.
I am the Deputy Lock, on job, and this is the Lock-house.