You'll need to use the alias for the font family, as follows:

\definefontfamily[english] [rm] [ebgaramond] [features={default, hlig=no}]

\setupbodyfont[english,10pt]

\starttext

ct st

\stoptext

On Wed, Dec 2, 2020 at 12:56 PM T. Kurt Bond <tkurtbond@gmail.com> wrote:

> Ah, ok.
>
> Here is a minimal NONWORKING example: the resulting PDF shows the ct and
> st ligatures.  What commands should I use to turn them off?
>
> \definefontfamily[english] [rm] [ebgaramond] [features={default,dlig=no}]
> \setupbodyfont[ebgaramond,10pt]
> \starttext
> ct st
> \stoptext
>
>
> On Wed, Dec 2, 2020 at 12:35 PM Hans Hagen <j.hagen@xs4all.nl> wrote:
>
>> On 12/2/2020 6:14 PM, T. Kurt Bond wrote:
>> > It does help.  Thanks.
>> >
>> > But how do I turn that font feature off in ConTeXt?
>> You forget to add a MWE ...
>>
>> Hans
>>
>> -----------------------------------------------------------------
>>                                            Hans Hagen | PRAGMA ADE
>>                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>>         tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
>> -----------------------------------------------------------------
>>
>
>
> --
> T. Kurt Bond, tkurtbond@gmail.com, https://tkurtbond.github.io
>
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