The phrase "concealed to" is not correct in written English.
You could use the phrase "concealed from" instead. For example: The thieves carefully concealed their identities from the police.
Both sentiments remarkably well concealed to this point.
They also argued that the work of the undercover operatives must be concealed to preserve the covert nature of the tactics.
Hence, same-sex affections and activity were concealed, to be known to and practised by only the leaders in secret – the guardians of Christianity as one might say.
He revealed that he was married last July, something he said he purposely concealed to protect his privacy in information-hungry New York.
None of Austen's novels is as full of tricks as Emma, and many of them are carefully concealed to reward the rereader.
It also means he'll never die, except by natural causes, and even then his death will be concealed to prevent uprisings.
There is no debate as to whether what is reflected in those photos is wrong, and nothing has been concealed to absolve perpetrators of crimes.
The knobs control a modern multispeaker infotainment system that has been craftily concealed to preserve the spartan 1960s look, a big factor in the aesthetic of the D Series interior.
Its charitable contributions amount to petty cash when measured against the corporation's vast resources, which have remained concealed to public scrutiny since before the days when witches were burnt at the stake.
Why did we not hold peace talks back in May?" asked Sergei Taruta, the Kiev-appointed governor of the Donetsk region.Unlike the association agreement, the vote on special status was held in secret, with journalists barred and voting rolls concealed to avoid accusations of treachery.
The inherent antisemitism and pro-Nazi sentiment of many corporations, high-born people and press barons was concealed to the British public in patriotic slogans, headlines and editorials about keeping Britain for the British or protecting the interests of the working class.
